B57211P0809M301

Overview

The B57211P0809M301 is a leaded inrush current limiter (ICL) manufactured by EPCOS, now part of TDK Electronics. This component features a nominal resistance of 8 Ohms with a tolerance of ±20%. It supports a maximum steady-state current of 4 Amperes and has a disk diameter of 13 mm (0.512 inches). The device utilizes a lead spacing of 7.50 mm (0.295 inches) for through-hole mounting. It is designed to limit high initial currents during power-up sequences in electronic circuits.

Feature Summary

• Provides effective limitation of inrush currents during circuit startup
• Features negative temperature coefficient characteristics for self-regulating resistance
• Offers robust protection for downstream components against thermal stress
• Utilizes a compact radial leaded package suitable for standard PCB layouts

Applications

• Switching power supplies
• Consumer electronics devices
• Industrial control systems
• Information technology equipment

Procurement Notes

Verify the specific suffix M301 corresponds to the required lead configuration and packaging format. Confirm that the 8-ohm resistance and 4A current rating align with the target circuit's inrush requirements. Ensure compatibility with the intended operating temperature range and safety certifications such as UL or VDE before finalizing procurement orders.

Selection Notes

Select this component when an 8-ohm initial resistance is required to suppress surge currents up to 4 Amperes continuously. Consider the 13mm diameter for spatial constraints on the printed circuit board. Evaluate the thermal dissipation capabilities relative to the application's duty cycle and ambient temperature conditions to ensure reliable long-term operation without degradation.

Part Context

This component belongs to the B57211 series of inrush current limiters produced by EPCOS, which is now integrated into TDK Electronics. The series is widely recognized for providing reliable overcurrent protection in various electronic applications. These devices are essential for maintaining circuit integrity by managing the high transient currents encountered during the initial energization phase of power systems.

Replacement Considerations

Cross-reference compatible parts within the B57211 series from TDK Electronics. Verify that substitute components match the 8-ohm resistance, 4A current rating, and 13mm physical dimensions. Ensure equivalent safety approvals and thermal performance characteristics are maintained to guarantee seamless integration into existing designs.